In this example, if you're using a 1/2" conduit with 0.25" diameter cables, you can safely install 4 cables, which corresponds to a 40% conduit fill.
A cable in conduit chart is essential for several reasons: cable in conduit chart
The NEC sets maximum fill percentages based on the number of conductors: In this example, if you're using a 1/2" conduit with 0